iokit/Kernel/IODMAEventSource.cpp

55   dmaController = IODMAController::getController(dmaProvider, inDMAIndex);
56   if (dmaController == 0) return false;
57   dmaController->retain();
59   result = dmaController->initDMAChannel(dmaProvider, this, &dmaIndex, inDMAIndex);
88   if ((dmaController == 0) || (dmaIndex == 0xFFFFFFFF)) return kIOReturnError;
94   result = dmaController->startDMACommand(dmaIndex, dmaCommand, direction, byteCount, byteOffset);
108   if ((dmaController == 0) || (dmaIndex == 0xFFFFFFFF)) return kIOReturnError;
110   return dmaController->stopDMACommand(dmaIndex, flush, timeout);
116   if ((dmaController == 0) || (dmaIndex == 0xFFFFFFFF)) return kIOReturnError;
118   return dmaController->queryDMACommand(dmaIndex, dmaCommand, transferCount, waitForIdle);
124   if ((dmaController == 0) || (dmaIndex == 0xFFFFFFFF)) return kIOReturnError;
126   return dmaController->getFIFODepth(dmaIndex);